langchain-ai/langgraph checkpoint==4.0.0

langgraph-checkpoint==4.0.0

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Changes since checkpoint==3.0.1

• fix: flip default on base cache (#6677)
• fix(checkpoint): InMemorySaver context managers should return self in… (#6529)
• fix: docstring for serializer protocol (#6525)
• chore: clean up some refs (#6487)
• chore: add pyproject.toml links (#6364)